【vue干货】vue事件

作者: 涂大宝 | 来源:发表于2018-01-05 11:23 被阅读0次

    vue干货第二集

    Vue和angular的区别
    • vue是一个mvvm框架(库),和angular类似,比较容易上手,小巧
    • vue:
      ■ 简单,易学 中文
      ■ 指令以v-xxx
      ■ 一片html代码配合上json,在new出来一个vue的实例
      ■ 一个个人维护项目
      ■ 适合:移动端项目,小巧
      ■ vue的发展势头很猛,GitHub上的star数量已经超越angular
    • angular:
      ■ 上手难,框架大一些
      ■ 指令以ng-xxx
      ■ 所有属性和方法都挂到¥scope身上
      ■ angular由Google维护
      ■ 适合:pc端项目
      *共同点:不兼容低版本IE
    常用指令:
    • 指令的含义:扩展html标签的功能,属性
    • angular常用的指令:ng-model(放在表单的input元素上), ng-controller
      *对应的vue也有常用的指令:v-model: 一般用在表单元素(input)上 双向数据绑定
    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>v-model指令</title>
        <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0">
        <meta name="apple-mobile-web-app-capable" content="yes">
        <meta name="apple-mobile-web-app-status-bar-style" content="black">
        <style>
    
        </style>
        <script src="vue.js"></script>
        <script>
            window.onload=function(){
                new Vue({
                    el:'body',
                    data:{
                        msg:'welcome vue'
                    }
                });
            };
        </script>
    </head>
    <body>
        <input type="text" v-model="msg">
        <br>
        {{msg}}
    </body>
    </html>
    
    • v-for 循环数组指令
    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>循环数组</title>
        <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0">
        <meta name="apple-mobile-web-app-capable" content="yes">
        <meta name="apple-mobile-web-app-status-bar-style" content="black">
        <style>
    
        </style>
        <script src="vue.js"></script>
        <script>
            window.onload=function(){
                new Vue({
                    el:'#box',
                    data:{
                        arr:['apple','banana','orange','pear'],
                        json:{a:'apple',b:'banana',c:'orange'}
                    }
                });
            };
        </script>
    </head>
    <body>
        <div id="box">
            <ul>
                <li v-for="value in arr">
                    {{value}}
                </li>
            </ul>
        </div>
    </body>
    </html>
    
    • 如何循环json文件:
    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>循环json文件</title>
        <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0">
        <meta name="apple-mobile-web-app-capable" content="yes">
        <meta name="apple-mobile-web-app-status-bar-style" content="black">
        <style>
    
        </style>
        <script src="vue.js"></script>
        <script>
            window.onload=function(){
                new Vue({
                    el:'#box',
                    data:{
                        arr:['apple','banana','orange','pear'],
                        json:{a:'apple',b:'banana',c:'orange'}
                    }
                });
            };
        </script>
    </head>
    <body>
        <div id="box">
            <ul>
                <li v-for="value in arr">
                    {{value}}   {{$index}}
                </li>
            </ul>
            <hr>
            <ul>
                <li v-for="value in json">
                    {{value}}   {{$index}}  {{$key}}
                </li>
            </ul>
    
            <hr>
            <ul>
                <li v-for="(k,v) in json">
                    {{k}}   {{v}}   {{$index}}  {{$key}}
                </li>
            </ul>
        </div>
    </body>
    </html>
    
    • 事件:在angularjs中是ng-click,在vue里面的基础事件 : v-on:click='函数'
    添加一个按钮,点击按钮时在页面中添加一个tomato
    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>基础事件</title>
        <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0">
        <meta name="apple-mobile-web-app-capable" content="yes">
        <meta name="apple-mobile-web-app-status-bar-style" content="black">
        <style>
    
        </style>
        <script src="vue.js"></script>
        <script>
            window.onload=function(){
                new Vue({
                    el:'#box',
                    data:{ //数据
                        arr:['apple','banana','orange','pear'],
                        json:{a:'apple',b:'banana',c:'orange'}
                    },
                    methods:{
                        add:function(){
                            this.arr.push('tomato');
                        }
                    }
                });
            };
        </script>
    </head>
    <body>
        <div id="box">
            <input type="button" value="按钮" v-on:click="add()">
            <br>
            <ul>
                <li v-for="value in arr">
                    {{value}}
                </li>
            </ul>
        </div>
    </body>
    </html>
    

    还有一些其他的事件:
    v-on:mouseover
    v-on:mouseout
    v-on:mousedown
    v-on:dblclick

    • v-show 显示隐藏:点击按钮div消失的demo,通过按钮的点击控制v-show的属性,
    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>显示隐藏</title>
        <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0">
        <meta name="apple-mobile-web-app-capable" content="yes">
        <meta name="apple-mobile-web-app-status-bar-style" content="black">
        <style>
    
        </style>
        <script src="vue.js"></script>
        <script>
            window.onload=function(){
                new Vue({
                    el:'#box',
                    data:{ //数据
                        a:true
                    }
                });
            };
        </script>
    </head>
    <body>
        <div id="box">
            <input type="button" value="按钮" v-on:click="a=false">
            <div style="width:100px; height:100px; background: red" v-show="a">
    
            </div>
        </div>
    </body>
    </html>
    
    • vue 事件简写
      v-on:click 等价 @click

    *事件冒泡
    阻止冒泡:cancelBubble

    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>阻止冒泡</title>
        <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0">
        <meta name="apple-mobile-web-app-capable" content="yes">
        <meta name="apple-mobile-web-app-status-bar-style" content="black">
        <style>
    
        </style>
        <script src="vue.js"></script>
        <script>
            window.onload=function(){
                new Vue({
                    el:'#box',
                    data:{
    
                    },
                    methods:{
                        show:function(ev){
                            alert(1);
                            ev.cancelBubble=true;
                        },
                        show2:function(){
                            alert(2);
                        }
                    }
                });
            };
        </script>
    </head>
    <body>
        <div id="box">
            <div @click="show2()">
                <input type="button" value="按钮" @click="show($event)">
            </div>
        </div>
    </body>
    </html>
    

    方法2: click.stop 推荐!!!

    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>阻止冒泡</title>
        <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0">
        <meta name="apple-mobile-web-app-capable" content="yes">
        <meta name="apple-mobile-web-app-status-bar-style" content="black">
        <style>
    
        </style>
        <script src="vue.js"></script>
        <script>
            window.onload=function(){
                new Vue({
                    el:'#box',
                    data:{
    
                    },
                    methods:{
                        show:function(){
                            alert(1);
                        },
                        show2:function(){
                            alert(2);
                        }
                    }
                });
            };
        </script>
    </head>
    <body>
        <div id="box">
            <div @click="show2()">
                <input type="button" value="按钮" @click.stop="show()">
            </div>
        </div>
    </body>
    </html>
    

    阻止默认行为:
    1.preventDefault
    2.contextDefault.prevent推荐!!

    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>阻止默认</title>
        <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0">
        <meta name="apple-mobile-web-app-capable" content="yes">
        <meta name="apple-mobile-web-app-status-bar-style" content="black">
        <style>
    
        </style>
        <script src="vue.js"></script>
        <script>
            window.onload=function(){
                new Vue({
                    el:'#box',
                    data:{
    
                    },
                    methods:{
                        show:function(ev){
                            alert(1);
                            ev.preventDefault();
                        }
                    }
                });
            };
        </script>
    </head>
    <body>
        <div id="box">
            <input type="button" value="按钮" @contextmenu="show($event)">
        </div>
    </body>
    </html>
    
    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>阻止默认事件</title>
        <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0">
        <meta name="apple-mobile-web-app-capable" content="yes">
        <meta name="apple-mobile-web-app-status-bar-style" content="black">
        <style>
    
        </style>
        <script src="vue.js"></script>
        <script>
            window.onload=function(){
                new Vue({
                    el:'#box',
                    data:{
    
                    },
                    methods:{
                        show:function(){
                            alert(1);
                        }
                    }
                });
            };
        </script>
    </head>
    <body>
        <div id="box">
            <input type="button" value="按钮" @contextmenu.prevent="show()">
        </div>
    </body>
    </html>
    

    常用的键 :简介的形式
    回车@keyup/keydown.enter ,
    上@keyup/keydown.up,
    下@keyup/keydown.down,
    左@keyup/keydown.left,
    右@keyup/keydown.right ,

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        本文标题:【vue干货】vue事件

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